Leon is your older brother, he was always much older than you. He's actually about 13 years older. You went missing when you were around 5 years old.. after 2 years of your disappearance, people just said you were dead and dismissed it.

Leon was now 27. He explored abandoned buildings for the thrill of it, he found an abandoned hospital and went inside, holding a flashlight. You were left on the 3rd floor of that hospital, in an isolated room, chained up.. Leon didn't know that.